EP0039377A1 - Warmformen rohrförmiger Gegenstände - Google Patents

Warmformen rohrförmiger Gegenstände Download PDF

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Publication number
EP0039377A1
EP0039377A1 EP19800301489 EP80301489A EP0039377A1 EP 0039377 A1 EP0039377 A1 EP 0039377A1 EP 19800301489 EP19800301489 EP 19800301489 EP 80301489 A EP80301489 A EP 80301489A EP 0039377 A1 EP0039377 A1 EP 0039377A1
Authority
EP
European Patent Office
Prior art keywords
tube
articles
oil
temperature
predetermined shape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19800301489
Other languages
English (en)
French (fr)
Other versions
EP0039377B1 (de
Inventor
Peter Robert Mitchell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP19800301489 priority Critical patent/EP0039377B1/de
Priority to DE8080301489T priority patent/DE3068662D1/de
Publication of EP0039377A1 publication Critical patent/EP0039377A1/de
Application granted granted Critical
Publication of EP0039377B1 publication Critical patent/EP0039377B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/12—Bending or folding helically, e.g. for making springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/004—Bent tubes

Definitions

  • the invention relates to thermoforming articles and is more particularly concerned with methods of manufacturing articles having a predetermined shape or form and manufactured from heat mouldable tubular material.
  • thermoplastic tubular material can be bent with a bending die at suitable temperatures followed by cooling to set the material in the bent configuration.
  • Such a process suffers the disadvantage that the finished articles are lacking in thermal stability, i.e. when the service conditions result in the article being reheated to temperatures approaching the temperature at which they were initially bent there is a tendency for articles to resume the original shape or form of the tubular material.
  • thermally stable predetermined shaped articles from tubular material that can be thermoformed.
  • the first of these methods comprises injection moulding in which the article is formed in an openable mould.
  • the mould comprises a casing and a core, the mould being designed so that the core can be removed from the moulded article.
  • the mould is heated.
  • the article is shaped from material while the material is in a plastic or pliable state and then the shaped article is baked or at least heated in an autoclave or oven.
  • a method of annealing tubular articles of heat mouldable material comprising heating the articles to the annealing temperature for a time to effect the annealing thereof and cooling the articles to set by passing a fluid therethrough while the articles are restrained in the predetermined shape or form.
  • the invention also provides a method of manufacturing an article having a predetermined shape or form from a tube of heat mouldable material comprising bending the tube to the predetermined shape, heating the tube to the annealing temperature of the material by passing heated fluid through the tube, maintaining the flow of heated fluid for a period of time sufficient to anneal the tube and cooling the tube while still constrained in the bent shape.
  • the tube is cooled by flowing cooling fluid through the tube after the flow of heating fluid is terminated.
  • both fluids are the same substance.
  • a heated fluid can be flowed through the tube to heat the tube before bending to a temperature at which the tube is flexible enough to be fitted to a jig structure defining the predetermined shape or form.
  • the fluid which is flowed through the tube must have a boiling point higher than the desired process temperature and can conveniently be oil.
  • Suitable heat mouldable or thermoformable materials are polyethylene, vinyl polymers such as polyvinyl chloride, polyvinyl acetate or polyamides.
  • the tubular blank can, for example, comprise a tube and can be shaped either by winding it onto a former to form a coil or by threading it onto or fixing it to a jig or like support structure.
  • the initial tube is straight and flexible and is wound into a coil 11 on a rigid, in this example wooden, cylindrical former 12.
  • the tube is formed of nylon hose, having an internal diameter of about 1 cm and a wall thickness of about 0.1 cms.
  • the former is about 12 to 15 cms. in diameter and about 60-75 cms long.
  • the former is detachably and rotatably mounted in a suitable frame (not shown).
  • the tube is wound as a coil onto the former either while the former is detached from its mounting frame or by rotating the former in its frame and feeding the tube onto the rotating former.
  • the former may be helically grooved to receive the tube.
  • the rigidity of the wall of the tube is such that the bore remains substantially constant and the tube does not flatten.
  • the coil When the coil has been wound on the former it is connected by a feed conduit 13 to a liquid pump 14 connected via a three-way valve V1 to a hot oil reservoir 16.
  • the oil in the reservoir is Shell Clavus 25.
  • An immersion heater is used in this example to heat the oil to a temperature of 1500C.
  • Oil is returned to the reservoir 16 by a return conduit 17 including a second three-way valve V2.
  • a second inlet of the supply valve VI is connected to the outlet of a cold oil reservoir 21 and a second outlet of the return valve V2 is connected to the inlet of the reservoir 21.
  • the cold oil is at room temperature but can be cooled to a lower temperature.
  • the pump After winding the coil and connecting up the conduits, the pump is switched on and hot oil flowed through the coil. The flow is maintained for about four minutes with the reservoir oil temperature at about 150 0 C.
  • the valves VI and V2 are then adjusted to change the oil flow from hot oil to cold oil. The cold oil is allowed to flow for about four minutes.
  • the oil is then vented from the coil by setting the valve 14 to its third setting in which air is pumped into the coil. Finally,and if required, the oil in the coil can be scavenged, for example by admitting a blast of nitrogen from a high pressure source into the coil.
  • the former After cooling, and scavenging if desired, the former is removed from its mounting frame and taken out from the coil.
  • the coil retains its helical form.
  • the helical coil can be extended and compressed in the manner of a concertina. Suitable fittings can be swaged or otherwise secured to the ends of the coil tube to permit it to be connected in a fluid or vacuum circuit.
  • the coil is thermally stable.
  • the article is of relatively large size.
  • the article is usable, for example,in the air conditioning system of a vehicle and replaces a similar product which has hitherto often been assembled from discrete parts, at least some of which were metal.
  • the article is formed from what is commercially identified as "high pressure nylon hose".
  • Such hose is flexible in that it can be wound into relatively large diameter coils of, say for a 1.25 cm bore hose, 75-100 cms diameter.
  • the hose cannot be taken around small radius curves e.g. curves of say 5 to 10 cms radius.
  • the article comprises five consecutive sections 31 to 35 and is between 1 1 2 and 2 meters in length.
  • the sections are not all in the same plane and, in fact, in this example only sections 31, 32 are in the same plane.
  • the article is formed using a jig structure which provides a grooved path into which the hose can be fitted. This is done by first laying out the hose alongside the jig path and then flowing oil at a temperature of '100°C through the hose for two minutes. By this time the hose has reached a temperature at which the nylon wall is sufficiently flexible to permit the tube to be fitted into and secured in the jig path. The oil temperature is then raised to between 1500C and 170°C and caused to flow for a further four minutes.
  • the hose is connected in an oil flow circuit similar to that illustrated in Figure 1. Thereafter, the oil flow is changed from hot oil to cold (room temperature) oil to cool the hose to set and then vented and, if required, scavenged.
  • a fluid other than oil eg a gas or water
  • the article can be moulded to have substantially any reasonable, required shape or form.
  • the two described articles retain the full bore through their length since collapse of the tube is prevented by the internal liquid pressure.
  • it is required to introduce a constriction this can be done when the tube is heated after bending.
  • an exterior fixing flat is required this can be moulded into the tube wall.
  • the ambient medium was atmospheric air. However there could be circumstances where a different medium, for example a liquid, is required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP19800301489 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände Expired EP0039377B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19800301489 EP0039377B1 (de) 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände
DE8080301489T DE3068662D1 (en) 1980-05-07 1980-05-07 Thermoforming tubular articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19800301489 EP0039377B1 (de) 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände

Publications (2)

Publication Number Publication Date
EP0039377A1 true EP0039377A1 (de) 1981-11-11
EP0039377B1 EP0039377B1 (de) 1984-07-25

Family

ID=8187159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800301489 Expired EP0039377B1 (de) 1980-05-07 1980-05-07 Warmformen rohrförmiger Gegenstände

Country Status (2)

Country Link
EP (1) EP0039377B1 (de)
DE (1) DE3068662D1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115380A1 (de) * 1983-01-05 1984-08-08 American National Can Company Verfahren zum Verpacken von Nahrungsmitteln in Kunststoffbehälter
US4643857A (en) * 1982-06-14 1987-02-17 Cousin Jean Claude Racket frame
US4667454A (en) * 1982-01-05 1987-05-26 American Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
US4880129A (en) * 1983-01-05 1989-11-14 American National Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
EP1108523A1 (de) * 1999-04-30 2001-06-20 Piolax Inc. Verfahren zum herstellen eines schlauchs aus flexiblem kunstharz
EP1286813A1 (de) * 1999-02-26 2003-03-05 Dayco Products, Inc. Verfahren zum herstellen von gebogenen thermoplastischen rohren
EP3593975A1 (de) * 2018-07-09 2020-01-15 MSV SYSTEMS CZ s.r.o. Verfahren zur formung von produkten aus hdpe oder pa, insbesondere zum räumlichen formen von hdpe- oder pa-rohren, und vorrichtung zur durchführung davon

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB902745A (en) * 1958-01-08 1962-08-09 Hilmor Ltd Improvements in or relating to the bending of thermoplastic tubes
DE1268361B (de) * 1965-07-27 1968-05-16 E H Karl Friedrich Naegele Dr Vorrichtung zum thermischen Fixieren von fortlaufend gewickelten Schraubenfedern auseinem Kunststoffstrang
GB1126421A (en) * 1964-09-26 1968-09-05 Rubber And Plastics Res Ass Of Method of forming hollow articles
GB1164936A (en) * 1966-06-03 1969-09-24 Aqua Tec Corp Apparatus for Forming Articles from Thermoplastic Tubing.
DE1929459A1 (de) * 1968-06-10 1969-12-11 Nat Res Dev Rohr aus thermisch erweichbarem Material sowie Verfahren und Vorrichtung zu seiner Herstellung
DE2355468A1 (de) * 1972-11-13 1974-05-16 Universal Plastic Pipe Bending Verfahren und vorrichtung zum biegen von kunststoffrohren
FR2342144A1 (fr) * 1976-02-24 1977-09-23 Lpa Les Produits Associes Procede de preformage d'un tuyau souple, a conduit multiple preferablement pour appareil hydraulique de soins corporels, moyen pour la mise en oeuvre du procede et tuyau obtenu par ce procede
DE2852061A1 (de) * 1977-12-02 1979-07-05 Yoshino Kogyosho Co Ltd Verfahren zur herstellung einer flasche aus einem gesaettigten polyesterharz

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB902745A (en) * 1958-01-08 1962-08-09 Hilmor Ltd Improvements in or relating to the bending of thermoplastic tubes
GB1126421A (en) * 1964-09-26 1968-09-05 Rubber And Plastics Res Ass Of Method of forming hollow articles
DE1268361B (de) * 1965-07-27 1968-05-16 E H Karl Friedrich Naegele Dr Vorrichtung zum thermischen Fixieren von fortlaufend gewickelten Schraubenfedern auseinem Kunststoffstrang
GB1164936A (en) * 1966-06-03 1969-09-24 Aqua Tec Corp Apparatus for Forming Articles from Thermoplastic Tubing.
DE1929459A1 (de) * 1968-06-10 1969-12-11 Nat Res Dev Rohr aus thermisch erweichbarem Material sowie Verfahren und Vorrichtung zu seiner Herstellung
DE2355468A1 (de) * 1972-11-13 1974-05-16 Universal Plastic Pipe Bending Verfahren und vorrichtung zum biegen von kunststoffrohren
FR2342144A1 (fr) * 1976-02-24 1977-09-23 Lpa Les Produits Associes Procede de preformage d'un tuyau souple, a conduit multiple preferablement pour appareil hydraulique de soins corporels, moyen pour la mise en oeuvre du procede et tuyau obtenu par ce procede
DE2852061A1 (de) * 1977-12-02 1979-07-05 Yoshino Kogyosho Co Ltd Verfahren zur herstellung einer flasche aus einem gesaettigten polyesterharz

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4667454A (en) * 1982-01-05 1987-05-26 American Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
US4643857A (en) * 1982-06-14 1987-02-17 Cousin Jean Claude Racket frame
EP0115380A1 (de) * 1983-01-05 1984-08-08 American National Can Company Verfahren zum Verpacken von Nahrungsmitteln in Kunststoffbehälter
US4880129A (en) * 1983-01-05 1989-11-14 American National Can Company Method of obtaining acceptable configuration of a plastic container after thermal food sterilization process
EP1286813A1 (de) * 1999-02-26 2003-03-05 Dayco Products, Inc. Verfahren zum herstellen von gebogenen thermoplastischen rohren
EP1286813A4 (de) * 1999-02-26 2004-12-01 Dayco Products Inc Verfahren zum herstellen von gebogenen thermoplastischen rohren
EP1108523A1 (de) * 1999-04-30 2001-06-20 Piolax Inc. Verfahren zum herstellen eines schlauchs aus flexiblem kunstharz
EP1108523A4 (de) * 1999-04-30 2003-02-05 Piolax Inc Verfahren zum herstellen eines schlauchs aus flexiblem kunstharz
US6855287B1 (en) 1999-04-30 2005-02-15 Piolax, Inc. Method of manufacturing flexible resin hose
EP3593975A1 (de) * 2018-07-09 2020-01-15 MSV SYSTEMS CZ s.r.o. Verfahren zur formung von produkten aus hdpe oder pa, insbesondere zum räumlichen formen von hdpe- oder pa-rohren, und vorrichtung zur durchführung davon

Also Published As

Publication number Publication date
EP0039377B1 (de) 1984-07-25
DE3068662D1 (en) 1984-08-30

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